canirequire

canirequire › ESM-only › decamelize

Is decamelize ESM-only? Can you require() it?

Convert a camelized string into a lowercased one with a custom separator: unicornRainbow → unicorn_rainbow

Last verified Sep 9, 2026 against decamelize@6.0.1. Markdown · JSON

ESM-only ESM-only since 6.0.0 — last CommonJS version is 5.0.1

decamelize dropped its CommonJS build in 6.0.0 (October 2021). The last version with a plain require()-able CommonJS entry is 5.0.1, published Sep 29, 2021; it declares support for Node.js >=10.

On Node.js 20.19+, 22.12+ and newer, require("decamelize") works with the latest version: Node.js loads synchronous ES modules through require(). Verified on Node.js 20, 22, 24 and 26. On Node.js 18, which has no require(esm), require("decamelize") fails with ERR_REQUIRE_ESM.

What to do

  1. On Node.js 20.19+, 22.12+ and newer, require("decamelize") works with the latest version: Node.js loads synchronous ES modules through require(). Verified on Node.js 20, 22, 24 and 26.
  2. From a CommonJS file, use a dynamic import inside an async function: const decamelize = await import("decamelize"). That works on every Node.js version the package supports (^12.20.0 || ^14.13.1 || >=16.0.0).
  3. If you need a synchronous require() or run Node.js 18: npm install decamelize@5.0.1, the last CommonJS release (published Sep 29, 2021); it declares Node.js >=10.
  4. TypeScript: types are bundled; install nothing extra.
Latest
6.0.1 (Aug 19, 2025)
Module format
ESM-only
Last CommonJS version
5.0.1
ESM-only since
6.0.0 (Oct 1, 2021)
TypeScript types
Bundled
Node engines
^12.20.0 || ^14.13.1 || >=16.0.0
Weekly downloads
62.6M
License
MIT

Does decamelize@6.0.1 actually load? Runtime test results

Installed and executed on Sep 9, 2026 with require("decamelize") from a CommonJS file and import "decamelize" from an ES module.

Runtimerequire("decamelize")import "decamelize"
Node.js 18✗ failsERR_REQUIRE_ESM✓ works
Node.js 20✓ works✓ works
Node.js 22✓ works✓ works
Node.js 24✓ works✓ works
Node.js 26✓ works✓ works
Bun 1.4.0✓ works✓ works

How to import decamelize

ES modules (import)

import * as decamelize from "decamelize";

Namespace import shown because the ESM entry may have no default export; use named imports for what it exports.

CommonJS (require)

// Node.js 20.19+, 22.12+ and newer (verified):
const decamelize = require("decamelize");

// Any Node.js version the package supports (^12.20.0 || ^14.13.1 || >=16.0.0), from an async function:
async function main() {
  const decamelize = await import("decamelize");
}

// Or pin the last CommonJS release (declares Node.js >=10):
// npm install decamelize@5.0.1

Module format by version

Derived from the type, main and exports fields of every stable release on npm, corrected where a runtime test of that version contradicted them (15 versions; the newest 15 shown).

VersionsFormatFirst published
6.0.0 – 6.0.1ESM-onlyOct 1, 2021
1.0.0 – 5.0.1CommonJSJan 24, 2015

Frequently asked

Is decamelize ESM-only?

decamelize@6.0.1 is ESM-only. decamelize dropped its CommonJS build in 6.0.0 (October 2021). The last version with a plain require()-able CommonJS entry is 5.0.1, published Sep 29, 2021; it declares support for Node.js >=10.

Which version of decamelize still supports CommonJS / require()?

5.0.1 is the last version of decamelize with a CommonJS build; it declares Node.js >=10. Install it with "npm install decamelize@5.0.1". Every version from 6.0.0 on is ESM-only.

How do I use decamelize from a CommonJS file?

From a CommonJS file, use a dynamic import inside an async function: const decamelize = await import("decamelize"). That works on every Node.js version the package supports (^12.20.0 || ^14.13.1 || >=16.0.0). On Node.js 20.19+, 22.12+ and newer, require("decamelize") works with the latest version: Node.js loads synchronous ES modules through require(). Verified on Node.js 20, 22, 24 and 26. Alternatively pin decamelize@5.0.1 (declares Node.js >=10).

Does decamelize work in Bun?

Yes. import "decamelize" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

Does decamelize ship TypeScript types?

Yes. decamelize bundles its own type declarations; no @types package is needed.

Links

Other esm-only packages

Similar popularity